发明授权
- 专利标题: Magnetic recording medium
- 专利标题(中): 磁记录介质
-
申请号: US09094496申请日: 1998-06-10
-
公开(公告)号: US06565964B1公开(公告)日: 2003-05-20
- 发明人: Yuichiro Murayama , Katsuhiko Meguro , Hiroshi Hashimoto
- 申请人: Yuichiro Murayama , Katsuhiko Meguro , Hiroshi Hashimoto
- 优先权: JP9-155382 19970612; JP9-155383 19970612
- 主分类号: G11B5702
- IPC分类号: G11B5702
摘要:
The present invention provides a magnetic recording medium, which comprises at least one magnetic layer where ferromagnetic powder and a binder are dispersed, and said magnetic layer is placed on a non-magnetic support, whereby said binder comprises a polyurethane resin obtained through reaction of polytetramethylene glycol and short-chain diol having cyclic structure or short-chain diol having a branched side chain containing two or more carbon atoms, said polytetramethylene glycol is contained in said polyurethane resin in an amount of 35 to 60 weight %, said short-chain diol is contained in said polyurethane resin in an amount of 10 to 40 weight %, and glass transition temperature of said polyurethane resin is within the range of 30° C. to 120° C.
信息查询